The Franklin O-405 (company designation 6AC-403) was an American air-cooled aircraft engine of the 1940s.
The engine was of six-cylinder, horizontally-opposed layout and displaced 405 cu in (6.64 L).
The power output was between 200 hp (149 kW) and 250 hp (186 kW) depending on variant.
The O-405-9 (6ACV-403) was a vertically mounted, fan cooled version for helicopters.
Data from [citation needed] Comparable engines Related lists